In this paper, we consider both the input models described above, and derive closed form expressions
of the output pdf in presence of a multiple-antenna channel affected by additive noise and
block-fading. In particular, in the case of i.i.d. Gaussian input, our procedure allows the
derivation of a closed-form expression for the output statistics of channels with unitarily
invariant fading law. Apart from the canonical i.i.d. Rayleigh fading, already treated in
[1]}, this encompasses the Rician channel with scalar Line-of-Sight (LOS) matrix,
whose analysis was previously limited to the evaluation of the fading number [2]}, and
the LOS MIMO [3]} with a certain amount of residual scattering. Also, we provide results for
the Land Mobile Satellite (LMS) with scalar average power LOS matrix [4]} and
for the above cases of MIMO Rayleigh and Rician fading communications impaired by Rayleigh-faded
co-channel interference [5]}. We remark that the expressions of the output pdf that we
derive hold for any arbitrary value of SNR.
